EBV BART microRNA Profiles and Host Gene Links in Gastric Cancer

Area of Science:

• Oncology
• Virology
• Molecular Biology

Background:

• Epstein-Barr virus (EBV) is linked to a specific gastric cancer (GC) subtype.
• EBV-encoded microRNAs (miRNAs) from the BART region influence tumor biology.
• Variability in EBV-miRNA expression and its significance in GC are not fully understood.

Purpose of the Study:

• To characterize EBV-derived miRNA expression in gastric tumors.
• To investigate the relationship between EBV-miRNA expression and host gene expression in GC.
• To identify a consistent pattern of EBV BART miRNAs in gastric cancer.

Main Methods:

• Small RNA sequencing of 11 primary gastric tumors.
• Quantitative RT-PCR validation in 21 gastric tumors.
• In silico analysis (ViRBase) for virus-host interactions.

Main Results:

• EBV-miRNAs were detected in a subset of gastric tumors with significant inter-tumor heterogeneity.
• A conserved set of BART miRNAs (miR-BART19-3p, miR-BART1-5p, etc.) dominated positive samples.
• Correlated expression patterns of BART miRNAs were observed, with concurrent elevation of multiple viral miRNAs.
• Differential expression of host genes (PTEN, BCL2L11, FOXO3, CDKN1A) was found in tumors stratified by EBV BART miRNA abundance.

Conclusions:

• A consistent BART miRNA expression pattern was identified in the studied gastric cancer cohort.
• Patient-level molecular evidence links EBV-miRNA regulatory output to host gene expression in GC.
• These findings contribute to understanding the molecular mechanisms of EBV-associated gastric cancer.